| 摘要 |
Disclosed is a solid polymer electrolyte which has excellent proton conductivity, while being improved in heat resistance. Also disclosed is a proton conducting membrane which is composed of such a solid polymer electrolyte. Specifically disclosed is a copolymer having a sulfonic acid group, which is characterized by containing a repeating unit represented by the following general formula (1). [chemical formula 1] (1) (In the formula, Y represents at least one structure selected from the group consisting of -CO-, -SO<SUB>2</SUB>-, -SO-, -CONH-, -COO-, -(CF<SUB>2</SUB>)<SUB>l</SUB>- (wherein l represents an integer of1-10) and -C(CF<SUB>3</SUB>)<SUB>2</SUB>-; W represents at least one structure selected from the group consisting of a direct bond, -CO-, -SO<SUB>2</SUB>-, -SO-, -CONH-, -COO-, -(CF<SUB>2</SUB>)<SUB>l</SUB>- (wherein l represents an integer of 1-10), -C(CF<SUB>3</SUB>)<SUB>2</SUB>-, -O- and -S-; Z represents a direct bond or at least one structure selected from the group consisting of -(CH<SUB>2</SUB>)<SUB>l</SUB>- (wherein l represents an integer of 1-10), -C(CH<SUB>3</SUB>)<SUB>2</SUB>-, -O-, -S-, -CO- and -SO<SUB>2</SUB>-; R<SUP>30</SUP> represents a nitrogen-containing aromatic ring having a substituent represented by -SO<SUB>3</SUB>H, -O(CH<SUB>2</SUB>)<SUB>h</SUB>SO<SUB>3</SUB>H or -O(CF<SUB>2</SUB>)<SUB>h</SUB>SO<SUB>3</SUB>H (wherein h represents an integer of 1-12); p represents an integer of 0-10; q represents an integer of 0-10; r represents an integer of 1-5; and k represents an integer of 0-4.) |
